with just 800 miles on mine I'm not real happy with gas mileage I'm getting I'm averaging around 15 mpg in my 2011 R/T most of this is city driving traded my R/T charger in on this and it was getting 22-23 mpg so guess that spoiled me but then my 05 Ram Rumble Bee was getting me about 19-20 mpg on avg and that was after mods. So I'm hoping mine does better once broken in.
Good luck with the new truck!!!!